Abstract: A traffic control system for mobile units has a plurality of stationary, passive units having electronic store capacity and transmit and receive facilities. The store of the passive units contains an information code which is unique to the unit and is related to the position by a mobile unit, the stationary units supply their information code, enabling the mobile unit to calculate its position. The store of the stationary units, in addition to the information codes of the units, contains stored traffic messages which are supplied together with the information code upon interrogation from the mobile unit. The movement from the mobile unit can be adjusted according to the traffic information received.

Abstract: A traffic supervision system for transport systems (17) of the type comprising a towing unit and one or more transporting or transported units, the towing unit having a data processing unit (1) with transmit and receive facilities adapted to read/write messages from stationarily located tags (10B) or to transmit information via a wireless transmission (7) in which the towed, transporting or transported unit or units have another data processing unit (15) having transmit and receive facilities capable of exchanging information with the data processing unit (1) in the towing unit via a wireless transmission (7) or via an interface (8).